Apparatus for unloading vacuum-pumps.



J. H. TEMPHN.

APPARATUS FOR .UNLOADING VACUUM'PUMPS, APPLICATION FILED nm'sr, 1910.

1,206,61 4. mama Nov. 2a, 1916 2 SHEETS-SHEET WIT SSE :NVENTOk J. H. TEMPUN APPARATUS FOR UNLOADING VACUUM PUMPS. APPLICATION FILED MAY'3I, 19m.

1,206,614. Patented Nov. 28, 1916.

2 SHEE TS-SHEET 2.

wmv s Q Q INVENTOR x/w JOSEPH 1-1. TEMPLIN,

OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, B Y MESNE ASSIGNMENTS. TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

APPARATUS FOR UNLOADING VACUUM-PUMPS.

Application filed May 31, 1910.

To (166 whom it may concern:

Be it known that l; Josnrn H. TEMPLIN, a citizen ot the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and usefulApparatus for Unloading l'aecum-Pumps. of which the following is a specification.

My invention relates in general to vacuum pumping mechanisms in connection with vacruim-chambers. or tanks wherein a predetermined vacuum is desired to be. eithausted and when same is attained, to prevent an over-load on the motor which is running continuously and driving the vacuum pump at an' approximately constant speed. I

. it relates more particularly however, to

' that class of vacuum pumps and tanks or f whereby any atmospheric pressur vacuum chambers as commonly.

used in household or portable vacuum cleaners. It is opposed however to that class of vacuum pumps wherein an enlarged clearance space in the pump-chamber is employed to limit the height of vacuum that the pump can exhaust, as in that construction the pump is designed to suit a predetermined vacuum and is limited to thatonly; and, it is further opposed to that class of vacuum pumps wherein auxiliary chambers are annexed or connected to the clearance space. of the vacuum pump for the purpose of increasing said clearance, and thereby vacuum to the height desired.

In my invention I require no auxiliary chambers or no extra clearance space in the. pump-chamber, as I employ means desired vacuum may be attained within the range of the vacuum pump as ordinarily constructed and my means can be adjusted and thereby the eX- treme vacuunr limited to any predetermined height desired ,without overloading the constantly running motor. And, it further relates to novel means Iemploy whereby the coacting with the vacuum attained regulates the loading and unloading ot'the motor.

Referring to the drawings in which similar letters of referenceindicate like parts Figure 1 is a sectional view of my preferable design of regulating device, shown in low pressure position and installed in a portablevacuum cleaner. Fig. 2 is an en Specification of Letters Patent.

rotate and in turn limiting the Patented Nov. 28, 1916. Serial in. 564,175. 2

la'rged view of the regulating device, shown in high vacuum position. w

1 represents a casing with a cover 2, and bottom 3. the whole forming. a vacuum chamber 1, hermetically sealed excepting the inlet 5 (which may be adapted to re-' ceive the well known suction hose andrenovater). and the outlet 6 which may be adapted to receive the well known blowing hose. p

' The pumping mechanism in the structure is comprised of a double acting diaphragm pump frame 7 with the diaphragms 8 and 9 secured to same. Dis-placing plates 10 and 1.1 are secured to the central portions of the respective diaphragms. tensions on the edges and ll the said displacers are connected to yoke 12 and by means of the connecting rods 13 they are connected to the crank-pins 14 on cranks 15- which are secured to motorshaft 16 and driven by motor 17.

By means of theelectric. plug 18 connection can light socket and the current conveyed by the cable 19 tothe motor 17 causes same to reciprocate the displacers and 'diaphragms, thereby causing an alternate inrush valves 20 and 21 and a corresponding rush outwardly through theo'utlet valves 22 and 23 into the passage 2i to the outlet 6 and thence to the free air. I l,

25 is a wall or partition separating the inlet and outlet valve ehambers, 26 is an opening in wall 25 and adaptedto receive a sliding plunger 27. 'llhecentral portion of a regulating diaphragm 28 is attached to theend of 27 by means of a screw 29 and washer 30. The outeredge of diaphragm 28 is securedto the wall or partition 25 by means of ring 31 and screws 32 and covers the opening 26 in said wall 25.

' 33 and 3t are two rollers pivotally supported on lugs 35 and 36 on plunger 27, these rollers are-adapted to engage, at the proper times, with the inclines 37 and 38 which depend from their respective inlet valves.

As will be seen plunger 27 is .hollow and j 1'05- contains a compression spring 39 therein.

' 40 is an adjustable plug sliding freely in plunger '27 and is screw threaded at 41, it is also adapted to be adjusted as desired in By means of 'exof the .displacers 10 of air through the inletbe made to. any ordinary electric I spring in the sliding assr AVAILABLE co the threaded lug 42 which is integral with the pump chamber 7.

From theforegoing description the operation of the machine may be readily understood. Power being applied to the motor, rotation of same causes reciprocation of the (liaphraguns, the inrush of the air causing the alternate opening and closing of the inlet and outlet valves. When the inlet of the vacuum-chamber or tank is closed or partially closed during the operation of cleaning or from any cause whatsoever the vacuum rises in the vacuum-cl'nimber and a corresponding atmospheric pressure increases on the outlet valves and also on the regulating diaphragm, this pressure on said diaphragm is resisted by the compression plunger until the vacuum has attained the predetermined height, to which the spring and adjusting plug have been previousl set. The pressure therefore being greater than the spring resistance, the regulating diaphragm and plunger moves forward and the rollers are brought into contact with the inclines on the respective inlet valves, thereby preventing closure of thevalves on the return stroke of the diaphragm, thereby permitting the vo ume of air exhausted from the vacuum chamber by the outward stroke of the diaphragni' to be returned to same on the return or inward stroke of the diaphragm. It

will be observed that the atmospheric pressure on the outlet valves keeps them closed until the inlet valves are permitted to close by the withdrawal of the plunger upon the lowering of the vacuum in the vacuum cham-' her or tank. It is also evident that s long as the inlet valves are held open the return stroke of the diaphragm consumes or requires very little or no power as the air withdrawn from the vacuum chamber by the outward strokes of the diaphragm is simply returned to the vacuum chamber in a single acting pump. In a double acting pump some or all of the. air may be returned to the oppositeend ot' the pump, the operation being repeated alternatelyuby;the pump until the vacuum in the vacuum chamber recedes below the predetermined limit upon which the regulating diaphragm is caused to recede by the. pressu'rt of the spring, the inlet valves close and the regular work of pumping the vacuum proceeds.

1 am aware of unloading devices in use on =-onzpressors and likewise so-called unload in: dc i ies in use on vacuum pumps; but 1 *licve .i am original in my method of establishing communication between the [inn and vacuum' chamber on the of the displacer and diaphragm at a predetermined vacuum and thereby return the withdrawn instead of a regulating diaphragm a piston 1 may be substituted, oran independent communicatiug stituted instead ofoperating the inlet valves, or the atmospheric pressure may be utilized by a device on the exterior. of the casing instead of the simpleulesign I have illustrated, which is self contained in the pump per 86, or various spring devices for regulating the pressure against the atmospheric pressure may where the pump andtanks are separated, the whole regulating device may be located in by-pass pipes connecting the clearances of the vacuum pump witlrtheyacuum tank, any or all of which changes [would be within the scope of my method and invention.

Having therefore descri my invention, what I claim and for which I desire Letters Patent is as follows i p n a vacuum creating apparatus, the, combination of a casing having a vacuumchamber, a frame therein, a pumping apparatus comprising two parallel opposed diaphragms carried by the frame, a motor, means connecting it to the diaphragms for actuating them, suction and discharge valves for the pumping apparatus, said valves being arranged parallel to each other with the suction valves opposed to each other, a suction and discharge chamber between the valves, a diaphragm separating them, a spring pressed member having a guide adapted to be moved by the diaphragm, rollers on said member,.and-xlugs having beveled faces carried by the suction valves, which lugs are adapted to be engaged by the rollers to lift the suction valves. off their seats when the vacuum in the vacuum chamber reachesa predetermined value.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH H. TEMPLIN.

Witnesses Wu. H. H IL, S. I. IIanrnn.

return striikes 60 air back to the vacuum chamber or to the outom dia )hra m or 'uston.

esign,

passage and valve may be 'subbe substituted, or in plants 1 

